/Engine/Source/Runtime/Engine/Classes/Engine/DebugCameraController.h
The selection trace starts from the center of the debug camera's view.
void ReceiveOnActorSelected ( [AActor](API\Runtime\Engine\GameFramework\AActor) * NewSelectedActor, const FVector & SelectHitLocation, const FVector & SelectHitNormal, const [FHitResult](API\Runtime\Engine\Engine\FHitResult) & Hit )